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authorDaniel Willmann <dwillmann@sysmocom.de>2016-07-12 20:25:33 +0200
committerPau Espin Pedrol <pespin@sysmocom.de>2018-05-15 21:28:50 +0200
commit77e92cb5dce9b9f5f2689c3ca58705f67edad616 (patch)
tree0be3bc072531e8166630c2098bf49abfe421d849 /codecs/amr/amrdecode.c
parent66a26f25698878caa0556127d09a5bdce73c76d7 (diff)
Add AMR codec supportosmocom/master
CMake work and rebase on current wireshark master by Pau Espin Pedrol. Change-Id: I5ec963b910f8f271aa2e5d680ea33e2170a6f367
Diffstat (limited to 'codecs/amr/amrdecode.c')
-rw-r--r--codecs/amr/amrdecode.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/codecs/amr/amrdecode.c b/codecs/amr/amrdecode.c
new file mode 100644
index 0000000..22b3f58
--- /dev/null
+++ b/codecs/amr/amrdecode.c
@@ -0,0 +1,98 @@
+/* amrdecode.c
+ * AMR codec
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+
+#include <glib.h>
+#include <string.h>
+#include "amrdecode.h"
+#include "ws_attributes.h"
+
+#include <opencore-amrnb/interf_dec.h>
+
+void *
+codec_amr_init(void)
+{
+ void *state;
+ state = Decoder_Interface_init();
+
+ return state;
+}
+
+void
+codec_amr_release(void *state)
+{
+ Decoder_Interface_exit(state);
+}
+
+unsigned
+codec_amr_get_channels(void *ctx _U_)
+{
+ return 1;
+}
+
+unsigned
+codec_amr_get_frequency(void *ctx _U_)
+{
+ return 8000;
+}
+
+size_t
+codec_amr_decode(void *state, const void *input, size_t inputSizeBytes, void *output,
+ size_t *outputSizeBytes)
+{
+ int mode;
+ unsigned packet_size;
+ static const uint8_t block_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
+
+ /* First byte is CMR, second is the Payload TOC */
+ mode = (((uint8_t *)input)[1] >> 3) & 0x0F;
+ packet_size = block_size[mode] + 2;
+
+ if (!output || !outputSizeBytes)
+ return 160*2;
+
+ *outputSizeBytes = 160 * 2; /* 160 frames, two byte per frame, 20ms */
+
+ /* If the size is screwed up, insert silence */
+ if (packet_size > inputSizeBytes) {
+ memset(output, 0, *outputSizeBytes);
+ return *outputSizeBytes;
+ }
+
+ Decoder_Interface_Decode(state, (const unsigned char *)input+1, (short *)output, 0);
+ return *outputSizeBytes;
+}
+
+/*
+ * Editor modelines - http://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */
+